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Requirements? A giant tank. Last I've read on several sites is a 6' tank. Even the sites which make their money selling fish recommend a 125 gallon minimum. They're very active swimmers, get well over a foot long, need to be kept in schools, can be prolific jumpers (first hand experience there) and are very skittish.
I've said this before, but IMO...Bala Sharks are one of the species which should not be commonly sold in chain stores. Selling them without informing customers of their true requirements is, to me, similar to selling Bettas in cups.